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| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2010-10-27 15:34:17 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-12-09 13:24:16 -0800 |
| commit | f6d7c2efda237f01fedc31965d056226e0df6a1d (patch) | |
| tree | 7178c9158597847a60155bcfb2f06c317a84504a | |
| parent | 6b5df7b78075c50f4918da9f4d7cdb99b145de23 (diff) | |
| download | lwn-f6d7c2efda237f01fedc31965d056226e0df6a1d.tar.gz lwn-f6d7c2efda237f01fedc31965d056226e0df6a1d.zip | |
ipc: initialize structure memory to zero for compat functions
commit 03145beb455cf5c20a761e8451e30b8a74ba58d9 upstream.
This takes care of leaking uninitialized kernel stack memory to
userspace from non-zeroed fields in structs in compat ipc functions.
Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | ipc/compat.c | 6 | ||||
| -rw-r--r-- | ipc/compat_mq.c | 5 |
2 files changed, 11 insertions, 0 deletions
diff --git a/ipc/compat.c b/ipc/compat.c index ab76fb0ef844..5e3e3a15661b 100644 --- a/ipc/compat.c +++ b/ipc/compat.c @@ -242,6 +242,8 @@ long compat_sys_semctl(int first, int second, int third, void __user *uptr) struct semid64_ds __user *up64; int version = compat_ipc_parse_version(&third); + memset(&s64, 0, sizeof(s64)); + if (!uptr) return -EINVAL; if (get_user(pad, (u32 __user *) uptr)) @@ -422,6 +424,8 @@ long compat_sys_msgctl(int first, int second, void __user *uptr) int version = compat_ipc_parse_version(&second); void __user *p; + memset(&m64, 0, sizeof(m64)); + switch (second & (~IPC_64)) { case IPC_INFO: case IPC_RMID: @@ -595,6 +599,8 @@ long compat_sys_shmctl(int first, int second, void __user *uptr) int err, err2; int version = compat_ipc_parse_version(&second); + memset(&s64, 0, sizeof(s64)); + switch (second & (~IPC_64)) { case IPC_RMID: case SHM_LOCK: diff --git a/ipc/compat_mq.c b/ipc/compat_mq.c index d8d1e9ff4e88..380ea4fe08e7 100644 --- a/ipc/compat_mq.c +++ b/ipc/compat_mq.c @@ -53,6 +53,9 @@ asmlinkage long compat_sys_mq_open(const char __user *u_name, void __user *p = NULL; if (u_attr && oflag & O_CREAT) { struct mq_attr attr; + + memset(&attr, 0, sizeof(attr)); + p = compat_alloc_user_space(sizeof(attr)); if (get_compat_mq_attr(&attr, u_attr) || copy_to_user(p, &attr, sizeof(attr))) @@ -127,6 +130,8 @@ asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes, struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p)); long ret; + memset(&mqstat, 0, sizeof(mqstat)); + if (u_mqstat) { if (get_compat_mq_attr(&mqstat, u_mqstat) || copy_to_user(p, &mqstat, sizeof(mqstat))) |